A little licking among friends
I've put off posting for this fic, but I haven't been able to find it. It might be a series, or one fairly long story. Jim, for some reason, develops a fetish/habit of licking Blair. All over his body, like he has to clean Blair or imprint himself on Blair. I don't think he transforms into a cat of any kind, but the licking occurs during intimate moments. Jim also gets 'growly' and possessive in public and private.
I read through Sorka's series, but I'm sure this is a different story. Thanks to magician for the initial help!